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author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-05-26 06:20:25 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-13 16:59:28 -0700 |
commit | 958502d836cf18c6f39bdb787b76d53839e4d8aa (patch) | |
tree | aee5d5c7301e5219c2f3637cee7afef638d4880d | |
parent | 602b5be4f14cabd5b751c340919958549475ab62 (diff) | |
download | op-kernel-dev-958502d836cf18c6f39bdb787b76d53839e4d8aa.zip op-kernel-dev-958502d836cf18c6f39bdb787b76d53839e4d8aa.tar.gz |
pstore/ram: Add some more documentation and examples
Suggested-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Colin Cross <ccross@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | Documentation/ramoops.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ramoops.txt b/Documentation/ramoops.txt index 4ba7db2..59a74a8 100644 --- a/Documentation/ramoops.txt +++ b/Documentation/ramoops.txt @@ -40,6 +40,12 @@ corrupt, but usually it is restorable. Setting the ramoops parameters can be done in 2 different manners: 1. Use the module parameters (which have the names of the variables described as before). + For quick debugging, you can also reserve parts of memory during boot + and then use the reserved memory for ramoops. For example, assuming a machine + with > 128 MB of memory, the following kernel command line will tell the + kernel to use only the first 128 MB of memory, and place ECC-protected ramoops + region at 128 MB boundary: + "mem=128M ramoops.mem_address=0x8000000 ramoops.ecc=1" 2. Use a platform device and set the platform data. The parameters can then be set through that platform data. An example of doing that is: @@ -70,6 +76,14 @@ if (ret) { return ret; } +You can specify either RAM memory or peripheral devices' memory. However, when +specifying RAM, be sure to reserve the memory by issuing memblock_reserve() +very early in the architecture code, e.g.: + +#include <linux/memblock.h> + +memblock_reserve(ramoops_data.mem_address, ramoops_data.mem_size); + 3. Dump format The data dump begins with a header, currently defined as "====" followed by a |